Discleroderma tuberculatum ( Magretti, 1897 ) Discleroderma gundari Terayama, 2006

Azevedo, Celso O., Vargas, Juan M. & Colombo, Wesley D., 2020, Synopsis of world Discleroderma Kieffer (Hymenoptera, Bethylidae), Zootaxa 4742 (3), pp. 467-480 : 469-471

Discleroderma tuberculatum ( Magretti, 1897)

Fig. 1 A–D

Redescription, female. Head subquadrate in dorsal view, lateral margin fully little outcurved, wider at eye level, vertex evenly outcurved in dorsal view. Gena not visible in dorsal view. Frontal angle of ocellar triangle acute.Anterior ocellus crossing supra-ocular line. Frons coriaceous. Notauli complete or incomplete, inconspicuous and poorly-impressed, narrow, straight, almost parallel. Parapsidal signum complete, wider than notauli, mostly straight, but little outcurved and converging posterad. First metapostnotal lateral carina straight, incomplete posteriorly.Anterior corner of metapectal-propodeal disc with cavity larger than space between metapostnotal median and metapostnotal-propodeal carinae. First abdominal spiracle elongated with straight and parallel margins and rounded corners, located on dorsal surface of metapectal-propodeal disc. Metasomal tergite III with transverse carina connnecting or not nodule; tergites IV–V each with one pair of small callus-shaped tubercles, connected by transverse carina. Intertubercular space 2 × outer-tubercular space for metasoma IV and V.

Material examined. THAILAND: 1 female, Sakon Nakhon, Phu Phan N[ational] P[ark], behind forest protection unit at Huay Wien Prai , 17°06.863’N 104°00.327’E, 387m, Malaise trap, 4–10.ii.2007, Winlon Kongnara leg., T1686 ( QSBG) ; 2 females, Sakon Nakhon, Phu Phan N[ational] P[ark], behind forest protection unit at Huay Wien Prai , 17°06.863’N 104°00.327’E, 387m, Malaise trap, 17–25.ii.2007, Winlon Kongnara leg., T1692 ( QSBG) ; 1 female, Sakon Nakhon, Phu Phan Yon N[ational] P[ark], deciduous forest, 16°55’N 104°11’E, 295m, Malaise trap, 23–29.vi.2006, Manop Ngoyjansri & Chatree Cheaukamjan leg., T300 ( QSBG) ; 1 female, Phetchabun, Khao Kho N[ational] P[ark], mixdeciduous near office, 16°39.479’N 101°08.105’E, 260m, Malaise trap, 5–12.ii.2007, Somchai Chachumnan & Saink Singtong leg., T1600 ( QSBG) ; 1 female, Kanchanaburi, Khuean Srinagarindra N[ational] P[ark], Tha Thung-na / Chong Kraborg , 14°29.972’N 98°53.035’E, 210m, Malaise trap 5–12.ii.2009, Boonnam & Phumarin leg. T4766 ( QSBG) .

Remarks. This species was known from Myanmar (Tenasserim) and is now recorded for the first time from Thailand (Kanchanaburi, Phetchabun, Sakon Nakhon). The Thai specimens have tubercles only on metasomal tergites IV–V, whereas the type has tubercles on metasomal tergites III–V. All specimens have a carina close to the posterior margin of metasomal tergite III. However the type has a pair of nodule at the end of this carina, the Thai specimens lack such nodules, having instead a small fold where the tubercles would have been. The notauli in the type are incomplete, anteriorly and posteriorly, and converging posterad, whereas in the Thai specimens they are complete and parallel. These differences are interpreted here as an intraspecific variation.

Discleroderma gundari Terayama, 2006

Fig. 1 E–H

Redescription, female. Head mostly converging anterad in dorsal view, lateral margin outcurved at temple level, otherwise almost straight, wider at temple level, vertex evenly outcurved. Gena not visible in dorsal view. Frontal angle of ocellar triangle acute. Anterior ocellus crossing supra-ocular line. Frons coriaceous. Notauli absent. Parapsidal signum almost complete, wide, mostly straight, but little outcurved and converging posterad. First metapostnotal lateral carina straight, incomplete posteriorly. Anterior corner of metapectal-propodeal disc with cavity smaller than space between metapostnotal median and metapostnotal-propodeal carinae. First abdominal spiracle elongated with straight and parallel margins and rounded corners, located on dorsal surface of metapectal-propodeal disc. Metasomal tergite III with one pair of very small nodules connected by transverse carina; tergites IV–V with one pair of small callus-shaped tubercles, connected by transverse carina. Inter-tubercular space 1.0 × outer-tubercular space for both metasoma segments IV and V.

Material examined. JAPAN, 1 female, Aichi, Inuyama, Kurisu , 19–25.VII.1996, T . Mabuchi , EMT ( UFES) .

Remarks. The specimen that we studied was identified by Mamoru Terayama in 2008, but we were not able to find any publication about it. This is therefore the first specimen recorded other than type series from Saitama Japan. This species exhibits the same variation on the tubercles of tergite III observed between the Thai specimens and the type of D. tuberculatum . Pictures of the holotype of D. gundari , available at the NIAES website, differ from the line drawing by Terayama (2006) in its original description. The main difference is the dorsal profile of the head is barrel-shaped in the line drawing of the publication, but clearly converging anterad in the type online photograph. The Inuyama specimen fits perfectly with the website picture.

Figures

FIGURE 1. A–D. Discleroderma tuberculatum, ♀. A. Habitus; B. Head, dorsal view; C. Mesosoma, dorsal view; D. Metasomal process, lateral view. E–H. Discleroderma gundari, ♀. E. Habitus; F. Head, dorsal view; G. Mesosoma, dor- sal view; H. Metasomal process, lateral view. Scales-bars: 200μm, except 500μm for A and E; 100μm for D and H.